Strongs Concordance:

The oldest of the four sons of Javan (Genesis 10:4), whose descendants peopled Greece. It has been supposed that Elishah's descendants peopled the Peloponnesus, which was known by the name of Elis. This may be meant by "the isles of Elishah" (Ezekiel 27:7).

(God is salvation), the eldest son of Javan. (Genesis 10:4) The residence of his descendants is described in (Ezekiel 27:7) as the isles of Elishah, whence the Phoenicians obtained their purple and blue dyes. Some connect the race of Elishah with the 'olians, others with Elishah, and in a more extended sense Peloponnesus, or even Hellas.